What are the answers to this question. Im stuck.

Josephine has a great garden with and area of 2x2 + x - 6 square feet

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?